"""
    Slixmpp: The Slick XMPP Library
    Copyright (C) 2010  Nathanael C. Fritz
    This file is part of Slixmpp.

    See the file LICENSE for copying permission.
"""

from slixmpp.stanza.rootstanza import RootStanza
from slixmpp.xmlstream import StanzaBase, ET


class Message(RootStanza):

    """
    XMPP's <message> stanzas are a "push" mechanism to send information
    to other XMPP entities without requiring a response.

    Chat clients will typically use <message> stanzas that have a type
    of either "chat" or "groupchat".

    When handling a message event, be sure to check if the message is
    an error response.

    Example <message> stanzas:

    .. code-block:: xml

        <message to="user1@example.com" from="user2@example.com">
          <body>Hi!</body>
        </message>

        <message type="groupchat" to="room@conference.example.com">
          <body>Hi everyone!</body>
        </message>

    Stanza Interface:
        - **body**: The main contents of the message.
        - **subject**: An optional description of the message's contents.
        - **mucroom**: (Read-only) The name of the MUC room that sent the message.
        - **mucnick**: (Read-only) The MUC nickname of message's sender.

    Attributes:
        - **types**: May be one of: normal, chat, headline, groupchat, or error.
    """

    name = 'message'
    namespace = 'jabber:client'
    plugin_attrib = name
    interfaces = {'type', 'to', 'from', 'id', 'body', 'subject', 'thread',
                  'parent_thread', 'mucroom', 'mucnick'}
    sub_interfaces = {'body', 'subject', 'thread'}
    lang_interfaces = sub_interfaces
    types = {'normal', 'chat', 'headline', 'error', 'groupchat'}

    def __init__(self, *args, **kwargs):
        """
        Initialize a new <message /> stanza with an optional 'id' value.

        Overrides StanzaBase.__init__.
        """
        StanzaBase.__init__(self, *args, **kwargs)
        if self['id'] == '':
            if self.stream is not None and self.stream.use_message_ids:
                self['id'] = self.stream.new_id()

    def get_type(self):
        """
        Return the message type.

        Overrides default stanza interface behavior.

        Returns 'normal' if no type attribute is present.

        :rtype: str
        """
        return self._get_attr('type', 'normal')

    def get_parent_thread(self):
        """Return the message thread's parent thread.

        :rtype: str
        """
        thread = self.xml.find('{%s}thread' % self.namespace)
        if thread is not None:
            return thread.attrib.get('parent', '')
        return ''

    def set_parent_thread(self, value):
        """Add or change the message thread's parent thread.

        :param str value: identifier of the thread"""
        thread = self.xml.find('{%s}thread' % self.namespace)
        if value:
            if thread is None:
                thread = ET.Element('{%s}thread' % self.namespace)
                self.xml.append(thread)
            thread.attrib['parent'] = value
        else:
            if thread is not None and 'parent' in thread.attrib:
                del thread.attrib['parent']

    def del_parent_thread(self):
        """Delete the message thread's parent reference."""
        thread = self.xml.find('{%s}thread' % self.namespace)
        if thread is not None and 'parent' in thread.attrib:
            del thread.attrib['parent']

    def chat(self):
        """Set the message type to 'chat'."""
        self['type'] = 'chat'
        return self

    def normal(self):
        """Set the message type to 'normal'."""
        self['type'] = 'normal'
        return self

    def reply(self, body=None, clear=True):
        """
        Create a message reply.

        Overrides StanzaBase.reply.

        Sets proper 'to' attribute if the message is from a MUC, and
        adds a message body if one is given.

        :param str body:  Optional text content for the message.
        :param bool clear: Indicates if existing content should be removed
                           before replying. Defaults to True.

        :rtype: :class:`~.Message`
        """
        new_message = StanzaBase.reply(self, clear)

        if self['type'] == 'groupchat':
            new_message['to'] = new_message['to'].bare

        new_message['thread'] = self['thread']
        new_message['parent_thread'] = self['parent_thread']

        del new_message['id']

        if body is not None:
            new_message['body'] = body
        return new_message

    def get_mucroom(self):
        """
        Return the name of the MUC room where the message originated.

        Read-only stanza interface.

        :rtype: str
        """
        if self['type'] == 'groupchat':
            return self['from'].bare
        else:
            return ''

    def get_mucnick(self):
        """
        Return the nickname of the MUC user that sent the message.

        Read-only stanza interface.

        :rtype: str
        """
        if self['type'] == 'groupchat':
            return self['from'].resource
        else:
            return ''

    def set_mucroom(self, value):
        """Dummy method to prevent modification."""
        pass

    def del_mucroom(self):
        """Dummy method to prevent deletion."""
        pass

    def set_mucnick(self, value):
        """Dummy method to prevent modification."""
        pass

    def del_mucnick(self):
        """Dummy method to prevent deletion."""
        pass
